Book Image

Mastering Reactive JavaScript

By : Erich de Souza Oliveira
Book Image

Mastering Reactive JavaScript

By: Erich de Souza Oliveira

Overview of this book

If you’re struggling to handle a large amount of data and don’t know how to improve your code readability, then reactive programming is the right solution for you. It lets you describe how your code behaves when changes happen and makes it easier to deal with real-time data. This book will teach you what reactive programming is, and how you can use it to write better applications. The book starts with the basics of reactive programming, what Reactive Extensions is, and how can you use it in JavaScript along with some reactive code using Bacon. Next, you’ll discover what an Observable and an Observer are and when to use them.You'll also find out how you can query data through operators, and how to use schedulers to react to changes. Moving on, you’ll explore the RxJs API, be introduced to the problem of data traffic (backpressure), and see how you can mitigate it. You’ll also learn about other important operators that can help improve your code readability, and you’ll see how to use transducers to compose operators. At the end of the book, you’ll get hands-on experience of using RxJs, and will create a real-time web chat using RxJs on the client and server, providing you with the complete package to master RxJs.
Table of Contents (11 chapters)

The transducers-js API

Before we learn how we can use transducers-js with RxJS, it is important to know which transformations we have available in this library. As we have already learned most of these transformations in RxJS, here is a quick overview of some of the transformations available in the transducers-js library API and what each one does:

  • transducers.complement (function): It takes a function and returns its complements (negates the result of the function call).
  • transducers.filter (function): It takes a function and filters the data based on the result of calling this function over it.
  • transducers.first(): It returns the first input.
  • (function): It uses the given function to map each value into another.
  • transducers.partitionAll (integer): It maps the inputs into arrays of a given size.
  • transducers.reduce (function, initialObject, iterable): It receives as a parameter a function, an initial value, and the iterable object to be reduced. It returns the reduction of the given...